[xwiki-users] skins & template : many questions

I found in the xwiki.wikiskins object (http://localhost:8080/xwiki/bin/edit/XWiki/XWikiSkins?editor=class) ... the list of vm templates header.vmwiewheader.vmview.vmfooter.vmpagemenu.vmcomments2.vmedit.vmlogo.png I suppose all theses vm used ... But In the folder "C:\Program Files\XWiki Enterprise\webapps\xwiki\templates" I see a file "startpage.vm" and when I edit it found xwikivars.vmlayoutvars.vmhtmlheader.vm  => (stylesheet.vm ... analytics.vm etc ...)header.vmmenuview.vm Which are used ? where can we found a description oof everyones of them ? Best Regards, Azzedine.